Add support for building .NET Framework applications with Docker about dotnet-framework-docker

[MichaelSimons]

The follow is the POR that @richlander and I came up with.

Would like to get a minimal image published and get feedback on it. Iterate as feedback is provided.

Need a 'full' tag that is independent of the targeted runtime in order to support changes to the build images outside of runtime changes. To do this the tags will be suffixes with YYYY.MM. If for some reason multiple revisions need to be released within a month, subsequent releases after the first one will contain an incremental number YYYY.MM-N

• Images
  • Lighter weight image that targets the latest runtime e.g. 4.7.1
    • Based on corresponding runtime image
    • Supports building and running tests
    • Only contains the targeting pack - not the dev pack.
    • This image aggressively moves to the latest targeting pack
    • Tags: 4.7.1-YYYY.MM, 4.7.1 (variations with OS suffix will also be included)
  • Kitchen sink image
    • Based on 3.5 image
    • Adds all targeting packs
    • Could contain build pack if requested
    • Could add other build tools as requested
    • Tags: all-versions-YYYY.MM, all-versions (variations with OS suffix will also be included)